Stress relieving blasting method for side wall rock pillar type rock burst of two synchronously tunneling deeply-buried tunnels

Abstract

The invention relates to a stress relieving blasting method for side wall rock pillar type rock burst of two synchronously tunneling deeply-buried tunnels. The invention aims to solve the problems of construction safety and construction progress caused by strong rock burst. The invention adopts the technical scheme that: a, drilling a group of blasting holes on each excavating surface of the tunnels on the two sides of a side wall rock pillar, wherein each group of blasting holes comprise a top hole, a middle upper hole, a middle hole and a middle lower hole which are formed along the axis of the tunnel from top to bottom, and side holes which are arranged along the tunnel walls on the two sides; b, charging explosive at the bottoms of the top holes in the depth range of 1.5 m, charging explosive in the side holes, the middle upper holes, the middle holes and the middle lower holes far away from the rock pillar side in the whole course, and charging explosive at the bottoms of the side holes near the rock pillar side in the depth range of 1.2 m; c, detonating any one of the tunnels, firstly blasting the top hole and the side hole near the rock pillar side, then blasting the middle upper hole, the middle hole and the middle lower hole, and finally blasting the side hole far away from the rock pillar side; d, detonating the other tunnel according to the sequence in the step c and deslagging; and e, repeating the steps a, b, c and d until excavation is finished. The method is applicable to underground engineering such as water conservancy and hydropower engineering, traffic and mine.

Description

technical field [0001] The invention relates to a rock burst stress relief blasting method for side wall rock bursts of two deep-buried tunnels that are simultaneously excavated, and is mainly applicable to underground projects such as water conservancy and hydropower projects, transportation, and mines. Background technique [0002] Rockburst is the destruction of surrounding rock caused by the sudden release of potential energy or strain energy accumulated in the rock mass during the excavation process of underground engineering, which can lead to casualties, damage to the working face or equipment, and its basic characteristics are sudden and violent. The rock pillar refers to the rock mass between two or several underground cavern groups during excavation, and the sidewall rock pillar refers to the rock mass structure on the side perpendicular to the excavation direction of the underground cavern. Affected by the construction period or other factors, sometimes it is nece...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to solve the problem of lateral rock burst during the excavation of two deeply buried tunnels (tunnels, roadways) to provide a simultaneously excavated sidewall rock burst stress release method for deep buried tunnels. Blasting method, by changing the properties of the rock mass, reducing or eliminating the degree of energy accumulation, in order to achieve the purpose of controlling rock bursts, and solve the construction safety and construction progress problems caused by strong rock bursts

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